12V Wired Doorbell 4 Core Wire Access Control System Home External Doorbell, 501 Original

12V Wired Doorbell 4 Core Wire Access Control System Home Hotel External Door Bell Features:12V external wired doorbell, easy to install, no need to replace or add batteries, long-lasting.Clear and loud sound, ding-dong ringtones output.Specifications:Working power supply: Voltage: 12VDCWorking current: 20mAWorking ambient temperature: -10 ℃ -45 ℃;Working relative humidity: 40% RH-90% RH;Product Color: White and spray silver;Material: ABS plastic material, anti-oxidation or discolorationInstallation: Wall hanging or double-sided adhesive pasteOverall size: 86 X 86 X 25 mm/3.39 X 3.39 X 0.98 inNote:1.Please allow 1-3 cm differs due to manual measurement.2.Due to the different display and different light, the picture may not show the actual color of the item. Thanks for your understanding.